X = int(input())

if X < 30:
    print("No")

else:
    print("Yes") X = int(input()) X int(input()) int input() input if X < 30:
    print("No")

else:
    print("Yes") X < 30 X 30 print("No") print "No" print("Yes") print "Yes" X = int(input()) int(input()) X
X = int(input())

if X < 30:
    print("No")

else:
    print("Yes")
